Mold.



J. B. BLAW.

MOLD.

APPLICATION FILED MAR.17, 1908.

Patented Jam 11, 1910.

-2 SHEETS-SHEET 1.

warmssszs J. B. BLAW.

MOLD.

APPLIOATI N FILED MAIL-17, 190a.

Patented 11, 1910.

2 SHEETSSHBET' 2.

JACOB B. BLAW, OF PITTSBURG, PENNSYLVANIA, ASSIGNORTO BLAW COLLAPSIBLE STEEL 'CENTERING COMPANY, OF PITTSBURG. PENNSYLVANIA, A CORPORATION OF NEW JERSEY.

Specification of Letters Patent.

Patented Jan. 11, 1910. 1908 Serial No. 421.715.

To all whom it may concern:

hzen of the- United States, residing at Pitts mold,

.the handle for collapsing the toggle levers,

Be it known that I, JACOB B. BLAW, a citiburg, in the county of Allegheny and State of Pepnsylvania, have invented certain new and useful Improvements in Molds, of which the following is a specification.

The invention relates to molds and particularly to those for forming the interior surfaces of concrete pipe sections. The invention has for its principal objects; the provision of an improved form of collapsible section which may be conveniently and rapidly operated; and the provision of improved means for holding the collapsing members in position. Certain embodiments of the invention are illustrated in the accompanying drawings, wherein Figure 1 is an end view of one form of Figure 2 is an end view of a modified form of mold,

Figure 3 is a transverse section on the line III III of Figure 1,

Figure 4 is an enlarged detail elevation of and the means thereon. for stoppingthe oscillation of such levers, and

Figure 5 is an enlarged detail showing a modified stop arrangement applied to the handle.

The moldis designed to form the inner surface of a section of pipe, the mold member for the outer surface of. the pipe being formed by any desired form of easing spaced away from the inner mold member a distance. equal to the thickness of pipe. Briefly stated, the mold comprises an outer sheet metal shell, together with supporting and collapsing levers spaced at intervals along the nterior and operable from a. longitudinally extended handle.

Referring first to the form of mold shown in Figures 1 and 3, 1, 1, are a pair of sheet metal plates constituting the shell of the mold and over-lapping in the manner'shown at their edges 22 and 3-3, Hand 5-5 are angleirons bolted to the interior of the the collapsing lever 7. The members 1-1 are guided upon each other and prevented from moving longitudinally with respect to each other by means of the guide members 8, which members are in the form of staples secured to the upper member 1' and projecting through slots 9 in the lower member 1.

One of the important features of my con 'struction is the collapsing lever together with the stop means provided therewith, which construction is shown clearly in F ig ures 1 and 4. By reference to these figures it will be seen that the lever is built up from four angles 10 placed back to back and providing flanges for engagement with the inner ends of the toggle levers 6. This handle extends longitudinally throughout the length of the mold and is provided at the end with a hand engaging portion. 11. In order to prevent too great an oscillation of the collapsing levers 6, the stop means shown in Figure 4 for limiting the movement of the levers is employed. ,The stop means are adapted to engage the levers as they oscillate in both directions, one'stop means being arranged to stop the movement of the levers when they are at right angles to the collapsing lever, and the other stop means being adapted to stop the collapsing levers when they reach a position at approximately from the position shown in Figure 4, at

which time the shell of the mold is suiticiently collapsed to permit its being removed from the pipe which has been formed. The stop means for each of the collapsing levers 6 is precisely the same so that a de scriptionof one stop means will indicate thec'onstruction of all. The stop comprises two opposing plates 12, which are placed on opposite sides of the angles constituting the collapsing lever 7, and are riveted together in the manner shown in Figure 4, the outer ends being spread apart at 13 to receive the lever 6. Each of the plates 12 is in the form of an angle having two projecting legs, so that each plate forms a half of two 'stops and four plates only are necessary to form stops for the four levers 6.

A modified arrangement of stops is shown in Figure 5, which modification consists in passing the, plates 12 which constitute the stops between the angles 10 of the collapsing handle, which angles 10' are of course necessarily spread apart in the manner inclicated in order to provide room for the reception of the plates 12; The ends of the o of stop.

lapping edgesQ and 3.

are spread apartza't 13 to receive plates -12 levers 6 as the other ,form

the collapsing In Figure 2 still another form of mold is shown, which form diifiers from that of Figure 1 only in that" the shell 1 consists of a single sheet, which sheet has the over- The necessity of guide means 8 for preventing longitudinal movement of the two edges with respect to each other is not so important in this form of mold as in the form shown in Flgure 1, for the reason that the continuous opposing 'side of the shell reduces the tendency of the edges to move longitudinally, and if desired the guide means 8 might be omitted.

Having thus described my invention and illustrated its use, what I claim as new and desire to secure by Letters Patent is the following':- 1. The combination with a collapsible 'dle, of a plurality of toggle levers plvoted to the flanges and the shell, and

stops for limiting the movement of the levers and comprlsinga pair of strips secured in oppolsition and having to receive the levers.

In testimony whereof I have hereunto signed my name in the presence of the two subscribed witnesses.

JACOB B. BLAW'. Witnesses:

HARVEY L. LECHNER, ARoHwoR'rH MARTIN.

their ends spread laterally 

